From patchwork Wed Jan 2 15:00:28 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Roger Quadros X-Patchwork-Id: 1924401 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork2.kernel.org Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) by patchwork2.kernel.org (Postfix) with ESMTP id 4905DDF215 for ; Wed, 2 Jan 2013 15:06:56 +0000 (UTC) Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.76 #1 (Red Hat Linux)) id 1TqPqS-0007hS-OQ; Wed, 02 Jan 2013 15:03:05 +0000 Received: from comal.ext.ti.com ([198.47.26.152]) by merlin.infradead.org with esmtps (Exim 4.76 #1 (Red Hat Linux)) id 1TqPoa-0006zj-GE for linux-arm-kernel@lists.infradead.org; Wed, 02 Jan 2013 15:01:09 +0000 Received: from dlelxv30.itg.ti.com ([172.17.2.17]) by comal.ext.ti.com (8.13.7/8.13.7) with ESMTP id r02F16xP023702; Wed, 2 Jan 2013 09:01:06 -0600 Received: from DFLE72.ent.ti.com (dfle72.ent.ti.com [128.247.5.109]) by dlelxv30.itg.ti.com (8.13.8/8.13.8) with ESMTP id r02F16sZ023074; Wed, 2 Jan 2013 09:01:06 -0600 Received: from dlelxv22.itg.ti.com (172.17.1.197) by dfle72.ent.ti.com (128.247.5.109) with Microsoft SMTP Server id 14.1.323.3; Wed, 2 Jan 2013 09:01:06 -0600 Received: from rockdesk.itg.ti.com (h0-11.vpn.ti.com [172.24.0.11]) by dlelxv22.itg.ti.com (8.13.8/8.13.8) with ESMTP id r02F0hZY013001; Wed, 2 Jan 2013 09:01:04 -0600 From: Roger Quadros To: , , Subject: [PATCH v5 08/22] mfd: omap-usb-tll: serialize access to TLL device Date: Wed, 2 Jan 2013 17:00:28 +0200 Message-ID: <1357138842-28964-9-git-send-email-rogerq@ti.com> X-Mailer: git-send-email 1.7.4.1 In-Reply-To: <1357138842-28964-1-git-send-email-rogerq@ti.com> References: <1357138842-28964-1-git-send-email-rogerq@ti.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20130102_100108_732478_32FFF60D X-CRM114-Status: GOOD ( 14.52 ) X-Spam-Score: -4.6 (----) X-Spam-Report: SpamAssassin version 3.3.2 on merlin.infradead.org summary: Content analysis details: (-4.6 points) pts rule name description ---- ---------------------- -------------------------------------------------- -5.0 RCVD_IN_DNSWL_HI RBL: Sender listed at http://www.dnswl.org/, high trust [198.47.26.152 listed in list.dnswl.org] 3.0 KHOP_BIG_TO_CC Sent to 10+ recipients instaed of Bcc or a list -0.0 SPF_PASS SPF: sender matches SPF record -0.7 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] Cc: sshtylyov@mvista.com, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, keshava_mgowda@ti.com, linux-arm-kernel@lists.infradead.org, linux-omap@vger.kernel.org, bjorn@mork.no, rogerq@ti.com X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linux-arm-kernel-bounces@lists.infradead.org Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org Get rid of the unnecessary spin_lock_irqsave/restore() as there is no interrupt handler for this driver. Instead we serialize access to tll_dev using a global spinlock. Signed-off-by: Roger Quadros --- drivers/mfd/omap-usb-tll.c | 53 ++++++++++++++++++++++--------------------- 1 files changed, 27 insertions(+), 26 deletions(-) diff --git a/drivers/mfd/omap-usb-tll.c b/drivers/mfd/omap-usb-tll.c index 5f61352..3dadacb 100644 --- a/drivers/mfd/omap-usb-tll.c +++ b/drivers/mfd/omap-usb-tll.c @@ -103,14 +103,13 @@ struct usbtll_omap { int nch; /* num. of channels */ struct usbtll_omap_platform_data *pdata; struct clk **ch_clk; - /* secure the register updates */ - spinlock_t lock; }; /*-------------------------------------------------------------------------*/ static const char usbtll_driver_name[] = USBTLL_DRIVER_NAME; static struct device *tll_dev; +static DEFINE_SPINLOCK(tll_lock); /* serialize access to tll_dev */ /*-------------------------------------------------------------------------*/ @@ -212,7 +211,6 @@ static int usbtll_omap_probe(struct platform_device *pdev) struct resource *res; struct usbtll_omap *tll; unsigned reg; - unsigned long flags; int ret = 0; int i, ver; bool needs_tll; @@ -230,8 +228,6 @@ static int usbtll_omap_probe(struct platform_device *pdev) return -ENODEV; } - spin_lock_init(&tll->lock); - tll->pdata = pdata; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); @@ -243,8 +239,6 @@ static int usbtll_omap_probe(struct platform_device *pdev) pm_runtime_enable(dev); pm_runtime_get_sync(dev); - spin_lock_irqsave(&tll->lock, flags); - ver = usbtll_read(base, OMAP_USBTLL_REVISION); switch (ver) { case OMAP_USBTLL_REV1: @@ -262,8 +256,6 @@ static int usbtll_omap_probe(struct platform_device *pdev) break; } - spin_unlock_irqrestore(&tll->lock, flags); - tll->ch_clk = devm_kzalloc(dev, sizeof(struct clk * [tll->nch]), GFP_KERNEL); if (!tll->ch_clk) { @@ -272,8 +264,6 @@ static int usbtll_omap_probe(struct platform_device *pdev) goto err_clk_alloc; } - spin_lock_irqsave(&tll->lock, flags); - for (i = 0; i < tll->nch; i++) { char clkname[] = "usb_tll_hs_usb_chx_clk"; struct clk *fck; @@ -332,10 +322,11 @@ static int usbtll_omap_probe(struct platform_device *pdev) } } - spin_unlock_irqrestore(&tll->lock, flags); pm_runtime_put_sync(dev); /* only after this can omap_tll_enable/disable work */ + spin_lock(&tll_lock); tll_dev = dev; + spin_unlock(&tll_lock); return 0; @@ -357,7 +348,9 @@ static int usbtll_omap_remove(struct platform_device *pdev) struct usbtll_omap *tll = platform_get_drvdata(pdev); int i; + spin_lock(&tll_lock); tll_dev = NULL; + spin_unlock(&tll_lock); for (i = 0; i < tll->nch; i++) clk_put(tll->ch_clk[i]); @@ -370,13 +363,10 @@ static int usbtll_runtime_resume(struct device *dev) { struct usbtll_omap *tll = dev_get_drvdata(dev); struct usbtll_omap_platform_data *pdata = tll->pdata; - unsigned long flags; int i; dev_dbg(dev, "usbtll_runtime_resume\n"); - spin_lock_irqsave(&tll->lock, flags); - for (i = 0; i < tll->nch; i++) { if (omap_usb_mode_needs_tll(pdata->port_mode[i])) { int r; @@ -392,8 +382,6 @@ static int usbtll_runtime_resume(struct device *dev) } } - spin_unlock_irqrestore(&tll->lock, flags); - return 0; } @@ -401,13 +389,10 @@ static int usbtll_runtime_suspend(struct device *dev) { struct usbtll_omap *tll = dev_get_drvdata(dev); struct usbtll_omap_platform_data *pdata = tll->pdata; - unsigned long flags; int i; dev_dbg(dev, "usbtll_runtime_suspend\n"); - spin_lock_irqsave(&tll->lock, flags); - for (i = 0; i < tll->nch; i++) { if (omap_usb_mode_needs_tll(pdata->port_mode[i])) { if (tll->ch_clk[i]) @@ -415,8 +400,6 @@ static int usbtll_runtime_suspend(struct device *dev) } } - spin_unlock_irqrestore(&tll->lock, flags); - return 0; } @@ -438,21 +421,39 @@ static struct platform_driver usbtll_omap_driver = { int omap_tll_enable(void) { + int ret; + + spin_lock(&tll_lock); + if (!tll_dev) { pr_err("%s: OMAP USB TLL not initialized\n", __func__); - return -ENODEV; + ret = -ENODEV; + } else { + ret = pm_runtime_get_sync(tll_dev); } - return pm_runtime_get_sync(tll_dev); + + spin_unlock(&tll_lock); + + return ret; } EXPORT_SYMBOL_GPL(omap_tll_enable); int omap_tll_disable(void) { + int ret; + + spin_lock(&tll_lock); + if (!tll_dev) { pr_err("%s: OMAP USB TLL not initialized\n", __func__); - return -ENODEV; + ret = -ENODEV; + } else { + ret = pm_runtime_put_sync(tll_dev); } - return pm_runtime_put_sync(tll_dev); + + spin_unlock(&tll_lock); + + return ret; } EXPORT_SYMBOL_GPL(omap_tll_disable);